<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图-->
        <el-card>
            <el-row>
                <el-col :span="4">
                    <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
                </el-col>
            </el-row>
            <!--角色列表区域-->
            <el-table :data="rolelist" border stripe>
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!--渲染一级权限-->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!--渲染二级和三级权限-->
                            <el-col :span="19">
                                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3, i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <el-table-column label="#" type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.id)">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeRoleById(scope.row.id)">删除</el-button>
                        <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!--添加角色的对话框-->
        <el-dialog title="添加角色" :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed">
            <!--内容主体区域-->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
                <el-form-item label="角色名称" prop="roleName">
                    <el-input v-model="addForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                    <el-input v-model="addForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取消</el-button>
                <el-button type="primary" @click="addRole">确定</el-button>
            </span>
        </el-dialog>
        <!--编辑角色对话框-->
        <el-dialog title="编辑角色" :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="70px">
                <el-form-item label="角色名称" prop="roleName">
                    <el-input v-model="editForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                    <el-input v-model="editForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取消</el-button>
                <el-button type="primary" @click="editRoleInfo">确定</el-button>
            </span>
        </el-dialog>
        <!--分配权限的对话框-->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%" @close="setRightDialogClosed">
            <!--树形控件-->
            <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all
            :default-checked-keys="defKeys" ref="treeRef">
            </el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            rolelist: [],
            addDialogVisible: false,
            editDialogVisible: false,
            setRightDialogVisible: false,// 控制分配权限对话框
            rightsList: [],
            roleId: '',
            treeProps: {
                label: 'authName',
                children: 'children'
            },// 树形控件的绑定对象
            defKeys: [],// 默认选中的节点id数组
            addForm: {
                roleName: '',
                roleDesc: ''
            },
            editForm: {

            },
            editFormRules: {
                roleName: [
                    {required: true, message: '请输入角色名称', trigger: 'blur'},
                    {min: 3, max: 10, message: '角色名称的长度在3到10个字符之间', trigger: 'blur'}
                ],
                roleDesc: [
                    {min: 10, max: 15, message: '角色描述的长度在10到15个字符之间', trigger: 'blur'}
                ]
            },
            addFormRules: {
                roleName: [
                    {required: true, message: '请输入角色名称', trigger: 'blur'},
                    {min: 3, max: 10, message: '角色名称的长度在3到10个字符之间', trigger: 'blur'}
                ],
                roleDesc: [
                    {min: 10, max: 15, message: '角色描述的长度在10到15个字符之间', trigger: 'blur'}
                ]
            }
        };
    },
    created(){
        this.getRoleList()
    },
    methods: {
        async getRoleList(){
            const {data: res} = await this.$http.get('roles')
            if(res.meta.status !== 200){
                return this.$message.error('获取角色列表失败')
            }else{
                this.rolelist = res.data
                //console.log(this.rolelist[0].children)
                //console.log(this.rolelist[0].children.length)
            }
        },
        // 监听添加角色对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 添加角色
        addRole(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid){
                    return;
                }else{
                    const {data: res} = await this.$http.post('roles', this.addForm)
                    if(res.meta.status !== 201){
                        this.$message.error('添加角色失败')
                    }else{
                        this.$message.success('添加角色成功')
                        this.addDialogVisible = false
                        this.getRoleList()
                    }
                }
            })
        },
        // 编辑角色对话框
        async showEditDialog(id){
            const {data: res} = await this.$http.get('/roles/'+id)
            if(res.meta.status !== 200){
                return this.$message.error('查询角色数据失败')
            }else{
                this.editForm = res.data
            }
            this.editDialogVisible = true
        },
        // 监听修改对话框的关闭事件
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 修改角色并提交
        editRoleInfo(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid){
                    return
                }else{
                    const {data: res} = await this.$http.put('roles/'+this.editForm.roleId, {
                        roleName: this.editForm.roleName,
                        roleDesc: this.editForm.roleDesc
                    })
                    if(res.meta.status !== 200){
                        return this.$message.error('更新角色信息失败')
                    }else{
                        this.editDialogVisible = false
                        this.getRoleList()
                        this.$message.success('更新角色信息成功')
                    }
                }
            })
        },
        async removeRoleById(id){
            const confirmResult = await this.$confirm('此操作将永久删除该角色，是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err);
            if(confirmResult !== 'confirm'){
                return this.$message.info('已经取消删除')
            }
            const {data: res} = await this.$http.delete('roles/'+id)
            if(res.meta.status !== 200){
                return this.$message.error('删除角色失败')
            }else{
                this.$message.success('删除用户成功')
                this.getRoleList()
            }
        },
        async removeRightById(role, rightId){
            const confirmResult = await this.$confirm('此操作将永久删除该角色，是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err);
            if(confirmResult !== 'confirm'){
                return this.$message.info('已经取消删除')
            }
            // 解构赋值
           const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
           if(res.meta.status !== 200){
                return this.$message.error('删除权限失败')
            }else{
                // 注释掉下面这行，目的是防止页面刷新，不然每次都要手动展开
                // this.getRoleList()
                role.children = res.data
            }
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role){
            this.roleId = role.id
            // 获取所有权限的数据
            const {data: res} = await this.$http.get('rights/tree')
            if(res.meta.status !== 200){
                return this.$message.error('获取权限数据失败')
            }else{
                // 获取到的权限数据，保存到data中
                this.rightsList = res.data
                this.getLeafKeys(role, this.defKeys)
                this.setRightDialogVisible = true
            }
        },
        // 通过递归的形式，获取角色下所有三级权限的id，并保存到数组defKeys中
        getLeafKeys(node, arr){
            // 如果当前node不包含children，则是三级节点
            if(!node.children){
                return arr.push(node.id)
            }

            node.children.forEach(item => 
            this.getLeafKeys(item, arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed(){
            this.defKeys = []
        },
        // 为角色分配权限
        async allotRights(){
            const keys = [
                // ... 为展开运算符
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            
            const idStr = keys.join(',')

            const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
            if(res.meta.status !== 200){
                return this.$message.error('分配权限失败')
            }else{
                this.$message.success('分配权限成功')
                this.getRoleList()
                this.setRightDialogVisible = false
            }
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}

.vcenter{
    display: flex;
    align-items: center;
}
</style>